Fermi/GBM sub-threshold triggers, when cross-checked with GECAM, yield 49 confirmed transients including 41 short GRBs, implying the short-GRB rate may be nearly twice the triggered-only rate.
The In-Flight Realtime Trigger and Localization Software of GECAM
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abstract
Realtime trigger and localization of bursts are the key functions of GECAM, which is an all-sky gamma-ray monitor launched in Dec 10, 2020. We developed a multifunctional trigger and localization software operating on the CPU of the GECAM electronic box (EBOX). This onboard software has the following features: high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation, dedicated localization algorithm optimized for short and long bursts respetively, short time latency of the trigger information which is downlinked throught the BeiDou satellite navigation System (BDS). This paper presents the detailed design and deveopment of this trigger and localization software system of GECAM, including the main functions, general design, workflow and algorithms, as well as the verification and demonstration of this software, including the on-ground trigger tests with simulated gamma-ray bursts made by a dedicated X-ray tube and the in-flight performance to real gamma-ray bursts and magnetar bursts.
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Extending the short gamma-ray burst population from sub-threshold triggers in Fermi/GBM and GECAM data and its implications
Fermi/GBM sub-threshold triggers, when cross-checked with GECAM, yield 49 confirmed transients including 41 short GRBs, implying the short-GRB rate may be nearly twice the triggered-only rate.